holkie stem caster wheels 4 inch casters set of 4, 7/16-inch stem diameter swivel castors heavy duty tpr rubber replacement castor for cart, stool, mop bucket, grill, shop vac 4 inch no brake 4 is up for auction in Industrial & Scientific. The current bid is $3.00, 86% below the $21.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.